Abstract
Although many CFD application methods have been reported for estimating windshield defogging pattern, few examples of simulation show accurate result of transient clearing pattern. To predict transient clearing pattern accurately, using a correct model of window glass clouding-clearing is important. As the result of our observation on fogged grass surfaces, fogging was found out to be an aggregation of water drops, so that new dropwise condensation-evaporation model was developed and applied transient defogging patterns were simulated with the CFD code including this model, and accuracy was verified on simplified compartment model and actual vehicles.